Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
#ifndef _NTIOAPI_H
#if (PHNT_MODE != PHNT_MODE_KERNEL)
#define FLTFL_CALLBACK_DATA_DRAINING_IO 0x00040000 // set if this operation is being drained. If set,
#endif
#endif
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